Water-cooled bosh for blast-furnaces.



No. 669,859. Patented Mar. l2, I90l.

A. SAHLIN; WATER COOLED BUSH FOR BLAST FURNACES.

(Application filed Sept. 7. 1900.:

(No Model.) 2 Sheets--Sheet I.

Patented Mar. l2, I90l.

A.,SAHL IN. WATER QDOLED BOSH FOR BLAST FURNACES.

(Application filed Sept, 7, 1900.)

(No Mddel.)

2 Sheets-Sheet 2 m: NuRms PETERS w, mofuu'ma. wumuuniu. D. c

STATES EMT reins.

AXEL SAI-ILIN, OF MILLOM, ENGLAND.

SPECIFICATION forming part of Letters Patent No. 669,859, dated March 12, 1901.

Application filed September 7, 1900. Serial No, 29,329- \No model.)

To all, whom, it may concern:

Be it known that I, AXEL SAHLIN, a citizen of the United States, residing at Millom, county of Cumberland, England, have invented certain new and useful Improvements in Water-Cooled Boshes for Blast-Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in water cooling devices for blast-furnace boshes and is designed to obtain an efficient cooling of the bosh with the employment of a relativelysmall quantity of water and in a uniform manner along lines at certain regular intervals from each other, which intervals may be one foot or even less, if desired. Other advantages of the construction are its comparative cheapness and the fact that it will keep itself clean during the entire run of the furnace and that it is read- "ily accessible for renewal or repair.

In the accompanying drawings, Figure 1 represents in vertical section the lower part of a blast-furnace provided with a watercooled bosh embodying my improvements. Fig. 2 represents, partly in section and partly in elevation, the water-cooled shell of the bosh on a larger scale. Fig. 3 represents, on a still larger scale, a cross-sectional view of the water-discharge trough; and Fig. 4 represents, also on a larger scale, an exterior view of a portion of the upper part of the water-cooled bosh-shell.

Similar letters of reference indicate similar parts throughout the several views.

In Fig. 1, A indicates the main body portion of a blast-furnace, supported in the usual manner familiar in modern practice and provided with an annulus or ring 0 and columns D, so that the bosh can be removed when necessary without tearing down the entire furnace or even taking out the lining above the ring.

E represents the furnace-hearth, within which the molten iron and slag collect below the twyers, and'B represents the boshlining inclosed within the water-cooled boshshell, whose construction is more fully shown in Figs. 2, 3, and 4:.

The main body portion a of the bosh-shell may conveniently consist of a series of halfinch plates having double i'iveted scams and forming when united an inverted frustum of a cone, to whose upper edge is riveted a ring I), of angle-iron, adapted to rest upon the column-plate O, as indicated in Fig. 1. At its lower edge the shell a is provided with a cylindrical continuation c, to which is attached a cylindrical ring (Z, forming the inner Wall of the discharge and collecting trough of the device. A similar ring e, of plate metal, forms the outer wall of the trough and is connected to the inner wall thereof through the intermediacyofabottom platefandangle-ironsgh.

In order to cool the shell ct, and consequently the bosh-lining B, I provide the shell with one or more exterior spiral troughs or runways, which at their upper ends receive a constant supply of cooling-Water and which discharge into the collecting-trough D. In the drawings I have for purposes of illustration and as indicating my preferred arrangement shown two such spiral troughs or runways, the convolutions of the spirals alternating with each other. It will be understood, however, that I do not limit my invention to the employment of any particular number of spiral troughs, inasmuch as in some instances they may be further multiplied and in other instances a single one will suflice, as will be readily understood by those skilled in the art.

The spiral troughs or runways, as illustrated, each consist of two and one-half turns or convolutions about the conical frustum a. I find that this number of convolutions, with a pitch of, say, three and one-half inches, gives satisfactory results in those instances where the upper inside diameter of the boshshell Ct is, say, twenty feet and the lower inside diameter of said shell is, say, fifteen feet and its height from the bottom of the trough d to the angle-iron b is, say, eight feet. I give these dimensions without intending to restrict myself to them, but merely to illustrate a practical embodiment of the invention for actual use. The spiral trough (or troughs, if more than one is used) is economically constructed of quarter inch plate 7;, forming the outer wall of the trough and riveted to the shell a through one-andone-half-inch bar-iron k, which latter constitutes a water-tight bottom for the spiral trough. In Fig. 4 the commencement of one of the spiral troughs is shown, and in Fig. 2 the termination of a trough. It will be understood that the commencements or upper ends of the two troughs are preferably located at one hundred and eighty degrees apart, as are also the terminations or lower ends thereof, in order to obtain the more effective distribution of the water-currents admitted through the water-inlet pipes m from any suitable source of water-supply.

The operation will be readily understood. A constant current of cooling-water is admitted through each of the pipes m to the corresponding spiral trough or runway and descends along the regularly-spaced convolutions of the spiral and finally discharges into the collecting-trough at the 'base of the shell 0,, the cooling effect being thus uniformly distributed along regular lines, which may be arranged closer or farther apart, according to the particular circumstances of the case. The constant current of water flowing down the incline of the spiral keeps the trough clean, inasmuch as all dust or dirt that might otherwise collect therein is carried down the incline into the collectingtrough, of much larger capacity. The collecting-trough, is provided with any suitable means of overflow, so as to carry off the eX- cess ofheated water which it receives to any suitable point of discharge.

Having thus described my invention, what I claim is 1. In a blast-furnace, a bosh, provided with an open external spiral trough or runway for the passage of a current of cooling-water; substantially as described.

2. In a blast-furnace, a bosh, provided with an open external spiral trough or runway, for the passage of a current of cooling-water, in combination with another open spiral trough or runway for the passage of a current of cooling-water, the convolutions of the two spirals alternating with each other substantially as described.

3. In a blast-furnace, a bosh, provided with an external spiral trough or runway for the passage of acurrent of cooling-water, in combination with a receiving-trough into which said spiral trough discharges; substantially as described.

4. In ablast-furnace, a bosh, provided with an exterior metallic shell of the general configuration of an inverted frustum of a cone, said shell having at its bottom an annular trough and having about its sides a spiral trough or troughs for the passage of coolingwater; substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

AXEL SAHLIN.

Witnesses:

FERGUS HUNTER, JOHN GRAHAM. 

